Rollup merge of #124484 - GKFX:offset_of_must_use, r=jieyouxu

Fix #124478 - offset_of! returns a temporary

This was due to the must_use() call. Adding HIR's `OffsetOf` to the must_use checking within the compiler avoids this issue while maintaining the lint output.

Fixes #124478. `@tgross35`

Author: jieyouxu